CN1461897A

CN1461897A - Cage with rotation symmetrical depression

Info

Publication number: CN1461897A
Application number: CN03138518A
Authority: CN
Inventors: 山本卓也
Original assignee: Minebea Co Ltd
Current assignee: Minebea Co Ltd
Priority date: 2002-05-30
Filing date: 2003-05-30
Publication date: 2003-12-17
Anticipated expiration: 2023-05-30
Also published as: EP1367277B1; US7044645B2; US20040037481A1; DE60321752D1; CN100378358C; EP1367277A2; EP1367277A3

Abstract

A retainer having an annular body with a plurality of pockets. Each pocket has a pair of corner portions that form an opening. The pockets have a spherical inside surface and a pair of tapered surfaces. Alternatively, the pockets can have a spherical inside surface and at least two pairs of tapered surfaces. The geometry of the pockets including the corner portions has rotational symmetry. The retainer improves lubricant retention, and reduces vibration, noise and non-repeating run out.

Description

Retainer with the symmetrical depression of rotation

The cross reference of related application

The application requires the preference of Japanese patent application No.2002-157430, and the applying date of this application is on May 30th, 2002, and title is a retainer ".

Technical field

The present invention relates to a kind of being used for remains on retainer in the ball distance ring with the lift-over parts.Especially, the present invention relates to a kind of retainer, and can be easy to make the mould that is used for it with the symmetrical depression of rotation.

Background technique

In the bearing that uses the lift-over parts, prevent the disengaging and because the friction that the contact between the adjacent lift-over parts causes of lift-over parts by using retainer.Use retainer to make the lift-over parts in bearing race, to rotate, make them keep separating specific fixed range simultaneously.

Figure 10 has represented to be used for the common retainer 1 of ball bearing.This retainer 1 is for having the annular element (only having represented a depression in Figure 10) of a plurality of depressions 3, and these depressions 3 are installed with ball 2.Ball 2 is enclosed in the interior ring and the seat ring between the outer shroud of ball bearing (not shown).Ball 2 rotates in the seat ring of ball bearing.The internal surface 4A of depression 3 is spherical, the surface curvature coupling of this sphere and ball 2.Usually, the inside diameter D 1 of depression 3 is provided with less times greater than the diameter D of ball 2, for example D1=1.03D.Because D1 greater than D, therefore forms clearance C between the internal surface of ball 2 and depression 3.This clearance C can be equipped with oiling agent.

Use retainer 1 can prevent contact between the adjacent ball 2, and ball 2 is steadily rotated.Therefore, suppressed friction torque and frictional heat, and ring and outer shroud steadily rotation relative to one another in making.

When using common retainer 1, between ball 2 and depression 3, form clearance C.This clearance C is equipped with oiling agent.But when rotating speed surpasses 10000rpm, for example because the self-excited vibration of ball 2 produces irregular fluctuation in clearance C.Irregular fluctuation in clearance C causes forming pump action, and this causes that again lubricant pressure fluctuation and the shear resistance that causes owing to lubricant viscosity fluctuate.Therefore, it is unstable that the rotation of ball bearing becomes, and non-repetitive circular runout (NRRO) increases, and vibration and noise increase, and oiling agent leaks from clearance C.

For example for hard disc of computer, disk and CD, recording medium is more and more finer and close, rotational speed of driving unit is more and more higher, and this requirement has very high running accuracy, low friction, than low noise and than the spindle drive motor bearing of long life, so that drive these indicators.

A kind of method that reduces to vibrate is to make clearance C littler.But make more hour when clearance C, the contact surface between the internal surface 4A of ball 2 and depression 3 increases.The increase of contact surface has reduced to be loaded on the amount of the oiling agent in the clearance C, and has increased rotation torque.

S.57-87827, the problems referred to above are made polyhedron-shaped the solution by the internal surface 4A with retainer depression 3 by U.S. Patent No. 4225199 and Japanese Utility Model.Polyhedron-shapedly provide in the fixed interval (FI) between depression internal surface 4A and the ball 2 and the point between ball 2 and retainer 1 contact, thereby increased the maintenance dose of oiling agent, and formed steadily rotation.

But, because the described depression internal surface of above-mentioned prior art reference 4A is polyhedron-shaped, therefore, be used to form mould complex-shaped of this retainer.Because for complicated shape, manufacturing step for example cuts, grinds and other machining will be more complicated, and therefore, the manufacturing of mould will be more expensive.Therefore, need provide a kind of ball bearing retainer, it is lubricated that this retainer will increase, and by reducing vibration and noise steadily rotates, and can be easy to and have cost benefit ground and make.

Summary of the invention

The present invention relates to a kind of retainer, this retainer has overcome the shortcoming of prior art, has improved the maintenance dose of oiling agent simultaneously and has reduced vibration, noise and non-repeat run-out.This retainer has ring body, and this ring body has a plurality of depressions.Each depression has a pair of corner part, and this forms opening to corner part.In one embodiment, depression has spherical inside surface, and pair of tapered surfaces is arranged.The geometrical shape that comprises the depression of corner part is rotational symmetric.In another embodiment, depression has spherical inside surface and at least two pairs of conical surfaces.At this moment, the geometrical shape that comprises the depression of corner part also is rotational symmetric.In two embodiments, the rotation symmetry of depression geometrical shape makes the mold component that forms depression in each example can utilize single running shaft and carry out machining with very high machining accuracy.

By reading the detailed description that also provides with reference to the accompanying drawings by example described below, will more know other features and advantages of the present invention.

Brief description of drawings

Fig. 1 is the sectional view of first embodiment's retainer concave portions.

Fig. 2 is the perspective view of first embodiment's retainer.

Fig. 3 is the enlarged view of depression of the retainer of Fig. 2.

Fig. 4 is the sectional view that passes the line A-A among Fig. 1.

Fig. 5 is the enlarged view of mold component of pocket portion that is used for the retainer of molded Fig. 2.

Fig. 6 is the perspective view of second embodiment's retainer.

Fig. 7 is the enlarged view of depression of the retainer of Fig. 6.

Fig. 8 is the amplification view of depression of the retainer of Fig. 6.

Fig. 9 is the enlarged view of mold component of pocket portion that is used for the retainer of molded Fig. 6.

Figure 10 is the amplification view of common pocket portion.

Embodiment

Fig. 2 and 3 has represented to be used to keep " hat " shape retainer 4 of a plurality of ball (not shown).Ball is the lift-over parts, and it is packed in the outer shroud and the seat ring between the interior ring that is formed at the radial ball bearing (not shown).A plurality of depressions 5 arrange equidistantly circumferentially that along retainer 4 each depression 5 keeps a ball.The number of depression 5 changes with the number of the ball in the bearing.

Each depression 5 has a pair of corner part 7, and this protrudes the edge of corner part 7 from annular element 6.Each depression 5 is along the inner periphery and the outer periphery direction of three direction opening-annular elements 6 and an edge direction of annular element 6.The internal surface 8 of depression 5 is and ball surface corresponding sphere (being recessed surface configuration).When ball was pressed in the opening of an edge of depression 5, corner part 7 trailed, thereby allowed ball to pack in the depression 5, and rotated this depression 5 in.

Fig. 1 has represented the sectional view of a depression 5 of retainer 4.The diameter D2 of the spherical inside surface 8 of depression 5 is greater than the diameter D of ball, preferably D2=1.03D-1.06D.Pair of tapered surfaces 9 is formed on the internal surface of a pair of corner part 7.The plane of conical surface 9 will intersect at summit P when extending in the space.Connecting the line of the center C of summit P and internal surface 8 forms five equilibrium at summit P place angle.Conical surface 9 falls in the circumference of diameter that diameter equals internal surface 8.Therefore, with the diameter of the tangent ball surface S of conical surface 9 less times greater than ball diameter D, but less than the diameter D2 of internal surface 8.The diameter D3 of this ball surface S can be set to D3=1.005D-1.025D; Preferably about D3=1.016D-1.020D.

The conical surface 9 of internal surface 8 contacts (see figure 1) with bottom 10 with ball.Therefore, ball is supported at 3.This makes ball rotation, and the self-excited vibration when being suppressed at high speed.Between depression 5 internal surfaces 8 and ball, form fixed interval (FI) C1.This fixed interval (FI) C1 is keeping oiling agent, and oiling agent is supplied with friction surface reliably, thereby increases lubricated and reduce vibration, noise and NRRO.Fig. 4 has represented the width W of the depression 5 of the ball of wherein packing into.This width W is littler by about 15% than the width of the common retainer depression of same size.Reducing width W causes the conical surface 9 of ball and depression 5 and the contact length between the bottom 10 to shorten.Contact length shortens to cause rubbing and reduces, and has reduced the bearing running torque, and this can reduce the diameter of spherical surface S again.The diameter of spherical surface S reduces to cause accurately to locate ball.Retainer 4 can for example nylon 66 or polyhenylene thioether (PPS) be made by the thermoplastic resin of injection-molded.

Fig. 5 has represented mold component 11.This mold component 11 is the parts of injection-molded instrument that can be used to form the depression 5 of retainer 4.This mold component 11 has cylindrical bodies unit 11A.Tapering part 11D links to each other with this cylindrical bodies unit 11A.Cylindrical section 11E links to each other with this tapering part 11D.Tapering part 11D than the diameter of major diameter less than cylindrical bodies unit 11A.Therefore, annular ring 11F is formed on the end of cylindrical bodies unit 11A.The diameter of cylindrical bodies unit 11A is chosen as like this, and promptly the top of corner part 7 is formed by this annular ring 11F.Tapering part 11D and cylindrical section 11E are formed on the entrance geometry of the opening of depression 5.Tapering part 11C links to each other with cylindrical section 11E, and spherical part 11B links to each other with this tapering part 11C.Tapering part 11C forms conical surface 9, and spherical part 11B forms the internal surface 8 of depression 5.Plane (planer) shape can be arranged at the bottom 10 of depression 5 internal surfaces.In order to make the bottom 10 plane shape be arranged, can carry out machining and plane shape be arranged spherical part 11B at its free end.The geometrical shape of mold component 11 is rotational symmetric, and can utilize single spin axis at an easy rate and with very high machining accuracy it is carried out machining.Therefore, the manufacture cost of mold component 11 reduces.Can utilize mould and make retainer 4 with above-mentioned geometrical shape.

In use, the ball of given number inserts in the retainer 4.The retainer 4 that comprises ball places between the outer shroud and interior ring of bearing again.Then, in the oiling agent injection bearing, and baffle plate is installed, is splashed the seat ring that enters into bearing with exterior object to prevent oiling agent.

Fig. 6-9 has represented second embodiment of " hat " shape retainer 12.The part different of only introducing retainer 12 in detail with retainer 4.

Retainer 12 has a plurality of depressions 5 (being 10 depressions shown in Fig. 6) that are formed on the annular element 6.On the internal surface 8 of each depression 5 pair of tapered surfaces 9 is arranged, in addition pair of tapered surfaces 13 towards the hole 5 bottoms.The plane of conical surface 9 and conical surface 13 intersects at summit P and Q (see figure 8) respectively when extending in the space.P and Q are on the line of the center C of passing through internal surface 8.Spherical surface S contacts with conical surface 13 with conical surface 9.The diameter of spherical surface S is less times greater than ball diameter D.The diameter D3 of spherical surface S is approximately D3=1.005D-1.025D, perhaps D3=1.01D-1.020D preferably.The dimension D 2 of internal surface 8 is approximately D2=1.03D-1.06D.

In retainer 12, ball is by

conical surface

9 and 13 and be supported at 4 some places.Fixed interval (FI) C1 is formed between the internal surface 8 of ball and depression 5, thereby causes producing and described similar effect of first embodiment and effect.

Retainer 12 also can have been made three pairs or more to conical surface.

Fig. 9 has represented mold component 14.This mold component 14 has cylindrical bodies unit 14A, tapering part 14G, cylindrical section 14H and annular ring 14F, and their shape and function are identical with annular ring 11F with aforementioned cylindrical bodies unit 11A, tapering part 11D, cylindrical section 11E respectively.Cylindrical section 14H links to each other with this tapering part 14E, and this tapering part 14E links to each other with spherical part 14C again.This spherical part 14C links to each other with tapering part 14D, and this tapering part 14D links to each other with spherical part 14B again.Tapering part 14E and 14D form

conical surface

9 and 13 respectively.Spherical part 14B and 14C form spherical inside surface 8.The geometrical shape of mold component 14A is rotational symmetric, and can utilize single spin axis at an easy rate and with very high machining accuracy it is carried out machining.Therefore, the manufacture cost of mold component 14 reduces.Can utilize mould and make retainer 12, and this retainer 12 will have with reference to retainer 4 described whole advantages with above-mentioned geometrical shape.

The foregoing description just as an example.This specification is to illustrate, rather than limits; Those skilled in the art can know other version according to this specification, and these versions will drop in the scope of accessory claim.

Claims

1. retainer comprises:

Annular element;

A plurality of depressions, these depressions are formed in this annular element;

Be formed at the internal surface in each depression; And

At least one pair of conical surface, this at least one pair of conical surface is formed in each depression; Wherein

The shape of this depression is rotational symmetric.

2. retainer according to claim 1, wherein: the diameter of described internal surface is greater than the diameter that inserts the lift-over parts in each depression.

3. retainer according to claim 1, wherein: the lift-over parts that insert in each depression are supported by described conical surface and internal surface.

4. retainer according to claim 1, wherein: this internal surface is spherical.

5. retainer according to claim 1, wherein, this retainer is made by the material of selecting from nylon 66 and polyhenylene thioether.

6. retainer according to claim 1, wherein: the diameter of described internal surface for the 1.03-1.06 of the diameter that inserts the lift-over parts in each depression doubly.

7. retainer according to claim 1, wherein: with the diameter on the tangent surface of described pair of tapered surfaces for the 1.016-1.02 of the diameter that inserts the lift-over parts in each depression doubly.

8. retainer comprises:

Annular element;

Be formed at the internal surface in each depression; And

At least two pairs of conical surfaces, these at least two pairs of conical surfaces are formed in each depression; Wherein

The shape of this depression is rotational symmetric.

9. retainer according to claim 8, wherein: the diameter of described internal surface is greater than the diameter that inserts the lift-over parts in each depression.

10. retainer according to claim 8, wherein: insert the interior lift-over parts of each depression by this tapered surface.

11. retainer according to claim 8, wherein: this internal surface is spherical.